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This article, updated and revised after having originally been published in Aeromilitaria, is understood to be one of the fullest accounts of these aircraft written so far and includes material accessed in the British National Archives, plus images that have never previously been published. Beginning with the lightweight Pterodactyl I of 1924, Geoffrey T. R. Hill took his concept forward through several stages to the test flying of a full-scale fighter prototype, the Pterodactyl V of 1934, and proposals were also made for a flying boat and other versions.